extends Camera3D

@export var pixelScale:float = 1.0;
@export var follow:Node3D;

const WORLD_UNITS:float = 32.0;

func _ready() -> void:
	pass


func _process(delta: float) -> void:
	# I tried a few things but this is most consistent for both backbuffer and
	# framebuffer viewports.
	var viewportHeight = get_viewport().get_visible_rect().size.y;
	var unitScale = pixelScale * WORLD_UNITS;

	var z:float = (
		tan((deg_to_rad(180) - deg_to_rad(fov)) / 2.0) *
		(viewportHeight / 2.0)
	) / unitScale;
	
	var look = follow.position;
	var position = Vector3(0, 0, 2) + look;

	look_at_from_position(
		Vector3(position.x, position.y + z, position.z),
		look
	);